Philadelphia (tca/dpa) — Princeton, New Jersey-raised actor Christopher Reeve was best known for playing Superman. But his superpower was his fight for advancements in spinal cord injury research and better quality of life for those with paralysis. It was a cause deeply personal to Reeve, who was paralyzed from the neck down after a near-fatal horse-riding accident in 1995. At 42, he was restricted to a wheelchair and forced to breathe through a ventilator. At the Kessler Institute for Rehabilitation in Marlton, New Jersey, Reeve learned to embrace the challenges his new life presented and est…